Detection of short-term response of the low ionosphere on gamma ray bursts

Abstract

© 2015. American Geophysical Union. All Rights Reserved. In this paper, we study the possibility of detection of short-term terrestrial lower ionospheric response to gamma ray bursts (GRBs) using a statistical analysis of perturbations of six very low or low-frequency (VLF/LF) radio signals emitted by transmitters located worldwide and recorded by VLF/LF receiver located in Belgrade (Serbia). We consider a sample of 54 short-lasting GRBs (shorter than 1 min) detected by the Swift satellite during the period 2009-2012. We find that a statistically significant perturbation can be present in the low ionosphere, and reactions on GRBs may be observed immediately after the beginning of the GRB event or with a time delay of 60 s-90 s. Key Points Short-term ionospheric reactions to GRBs are studied for the first time Short-term ionospheric reactions are confirmed during and after GRB events Statistical analysis indicates possibility of direct and secondary ionization